| Summary: | 碩士 === 國立海洋大學 === 機械與輪機工程學系 === 88 === In high-speed-milling process, big cutting force will cause the cutting tool wear, breakage, short life, and bad machining quality. To avoid such situation, a grey fuzzy controller is designed to attain constant cutting force control in this thesis. The difference between fuzzy and grey fuzzy control systems is that the grey fuzzy control is according to the future state, which is predicted by the grey model. Thus there will be the advantage of prior control. On the other hand, the cutting process is a non-linear process. For the purpose of constant cutting force control, the feedrate will not change in proportion to the cutting depth linearly, and the metal removal rate will also change in such various cutting conditions. The auxiliary metal removal rate controller design will compensate the reduced feedrate by increasing the spindle speed to reach the effect of constant metal removal rate. The models of surface roughness and cutting forces in the milling system are found by experiment, and are put into the controlled system to have the milling force control process approach the reality. The results show the grey fuzzy control system can maintain constant cutting force and metal removal rate at the same time in various cutting conditions.
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